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Method for nitrogen suction operation under low yield of natural gas of stratum

A natural gas and nitrogen technology, which is used in earth-moving drilling, wellbore/well components, construction, etc., can solve the problems of natural gas easily overflowing wellhead, hidden danger of gas drilling open well operation, etc.

Active Publication Date: 2020-02-21
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The sand flushing system disclosed in this patent document for cleaning the sand sedimentation of the blowout preventer of the nitrogen drilling wellhead, although the gas-liquid two-phase mixed fluid is used as the cleaning medium, can form a turbulent agitation flushing mode for the sand sedimentation of the blowout preventer chamber, which is easier Thoroughly remove sand, and at the same time help to clean the oil sludge that is difficult to clean. However, during open well operations such as "tripping out and replacing rubber cores", natural gas is easy to overflow the wellhead, resulting in great safety hazards in gas drilling open well operations.

Method used

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  • Method for nitrogen suction operation under low yield of natural gas of stratum
  • Method for nitrogen suction operation under low yield of natural gas of stratum
  • Method for nitrogen suction operation under low yield of natural gas of stratum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 and figure 2 , a nitrogen pumping operation method under the condition of a small amount of natural gas from the formation, comprising the following steps:

[0037] a. When a small amount of natural gas comes out of the formation and nitrogen drilling operation is performed, close the first flat valve 25, the second flat valve 26, the first suction flat valve 15 and the second suction flat valve 16 in the nitrogen suction system, and open The third flat valve 27, the fourth flat valve 28 and the fifth flat valve 29;

[0038] b. The nitrogen produced by the first nitrogen generating unit 2 enters the low-pressure gate valve group 9 through the first low-pressure gas injection pipeline 20, and the nitrogen produced by the second nitrogen generating unit 3 enters the low-pressure gate valve group 9 through the second low-pressure gas injection pipeline 21, Then enter the booster unit 10 through the low-pressure hose, and enter the rig standpipe 1 through th...

Embodiment 2

[0043] see figure 1 and figure 2 , a nitrogen pumping operation method under the condition of a small amount of natural gas from the formation, comprising the following steps:

[0044] a. When a small amount of natural gas comes out of the formation and nitrogen drilling operation is performed, close the first flat valve 25, the second flat valve 26, the first suction flat valve 15 and the second suction flat valve 16 in the nitrogen suction system, and open The third flat valve 27, the fourth flat valve 28 and the fifth flat valve 29;

[0045] b. The nitrogen produced by the first nitrogen generating unit 2 enters the low-pressure gate valve group 9 through the first low-pressure gas injection pipeline 20, and the nitrogen produced by the second nitrogen generating unit 3 enters the low-pressure gate valve group 9 through the second low-pressure gas injection pipeline 21, Then enter the booster unit 10 through the low-pressure hose, and enter the rig standpipe 1 through th...

Embodiment 3

[0051] see figure 1 and figure 2 , a nitrogen pumping operation method under the condition of a small amount of natural gas from the formation, comprising the following steps:

[0052] a. When a small amount of natural gas comes out of the formation and nitrogen drilling operation is performed, close the first flat valve 25, the second flat valve 26, the first suction flat valve 15 and the second suction flat valve 16 in the nitrogen suction system, and open The third flat valve 27, the fourth flat valve 28 and the fifth flat valve 29;

[0053] b. The nitrogen produced by the first nitrogen generating unit 2 enters the low-pressure gate valve group 9 through the first low-pressure gas injection pipeline 20, and the nitrogen produced by the second nitrogen generating unit 3 enters the low-pressure gate valve group 9 through the second low-pressure gas injection pipeline 21, Then enter the booster unit 10 through the low-pressure hose, and enter the rig standpipe 1 through th...

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Abstract

The invention discloses a method for nitrogen suction operation under the low yield of natural gas of a stratum, and belongs to the field of drilling engineering. The method includes the following steps of a, switching off a first flat valve, a second flat valve, a first suction flat valve and a second suction flat valve during nitrogen drilling operation; b, making nitrogen enter a drilling machine vertical pipe through a high-pressure gas injection pipeline after pressurizing the nitrogen; c, injecting nitrogen for suction into a first suction short connector and injecting nitrogen for suction into a second suction short connector during round trip operation in the nitrogen drilling period so that no natural gas can overflow from a well mouth; and d, stopping injecting nitrogen into thedrilling machine vertical pipe and sucking the natural gas to the outlet end of a well field sand discharge pipeline to be burned and evacuated during rubber core replacement operation in the nitrogendrilling period. By injecting the nitrogen into the sand discharge pipeline, generating suction force at the well mouth and sucking and guiding the natural gas generated in the stratum into the sanddischarge pipeline, the natural gas is prevented from overflowing from the well mouth, and the safety of round trip operation and rubber core replacement well open operation is effectively improved.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to a nitrogen pumping operation method under the condition that a small amount of natural gas is produced from the formation. Background technique [0002] Gas drilling technology has the advantages of speed increase, leakage control and reservoir protection. It is more and more common to use gas to increase the drilling speed in gas-bearing intervals with poor drillability. Once a small amount of natural gas is drilled in the formation, the natural gas content is ≤10000m 3 / d, the circulating medium is converted to inert gas nitrogen to avoid downhole explosion accidents, but often due to the lack of annular blowout preventers, the size of the drilling tool is large, and the rotation control head assembly cannot be passed, etc., when tripping and replacing rubber When working in open wells such as cores, natural gas may overflow the wellhead, which brings great safety...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B41/00E21B21/16E21B21/10
CPCE21B43/00E21B41/005E21B21/16E21B21/106
Inventor 邓柯徐忠祥周长虹刘殿琛唐贵李宬晓李刚范黎明董仕明王虎
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD